<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<my-search @tap="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{height:wh+'px'}">
				<block v-for="(item1,i1) in cateList" :key="i1">
					<view :class="['left-scroll-view-item',i1===active?'active':'']" @tap="activeChange(i1)" >{{item1.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" class="right-scroll-view"  :scroll-top="scrollTop" :style="{height:wh+'px'}">
			<view class="cate-lv2" v-for="(item2,i2) in cateLevelTwoList" :key="i2" >
				<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
				 <view class="cate-lv3-list">
				      <!-- 三级分类 Item 项 -->
				      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @tap="gotoGoodsList(item3)">
				        <!-- 图片 -->
				        <image :src="item3.cat_icon"></image>
				        <!-- 文本 -->
				        <text>{{item3.cat_name}}</text>
				      </view>
				    </view>
			</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>

	export default {
		data() {
			return {
				// 当前设备可用高度
				wh:0,
				cateList:[],//一级分类列表
				active:0,
				cateLevelTwoList:[],//二级分类列表
				// 滚动条距离顶部的距离
				    scrollTop: 0
			}
		},
		onLoad(){
		const systemInfo=uni.getSystemInfoSync()
			// console.log(systemInfo)
			this.wh=systemInfo.windowHeight-50
			
			this.getCateList()
		},
		methods:{
		async	getCateList(){
			const{ data:res }=await	uni.$http.get('/api/public/v1/categories')
			if(res.meta.status!==200){
				return uni.$showMsg()
			}
			this.cateList=res.message
			this.cateLevelTwoList=res.message[0].children//默认为二级分类赋值
			// console.log(this.cateList)
			},
			activeChange(id){
				this.active=id
				// 点击不同一级分类显示不同二级分类
				this.cateLevelTwoList=this.cateList[id].children
				this.scrollTop=this.scrollTop === 0 ? 1 : 0//切换一级分类后重置滚动条的位置
			},
			// 跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({ url:'/subpkg/goods_list/goods_list?cid='+item.cat_id })
			},
			gotoSearch(){
				uni.navigateTo({ url:'/subpkg/search/search' })
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	.left-scroll-view{
		width: 120px;
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			&.active{
				background-color: #white;
				position: relative;
				&::before{
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: red;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	.right-scroll-view{
		.cate-lv2-title {
		  font-size: 12px;
		  font-weight: bold;
		  text-align: center;
		  padding: 15px 0;
		}
		.cate-lv3-list {
		  display: flex;
		  flex-wrap: wrap;
		
		  .cate-lv3-item {
		    width: 33.33%;
		    margin-bottom: 10px;
		    display: flex;
		    flex-direction: column;
		    align-items: center;
		
		    image {
		      width: 60px;
		      height: 60px;
		    }
		
		    text {
		      font-size: 12px;
		    }
		  }
		}
	}
	
}
</style>